"Fix the responsibility for" is a phrase used commonly in legal and business environments to assign accountability for an action or outcome. However, there are several synonyms to convey the same meaning, including 'attribute the responsibility', 'determine liability for', 'pinpoint culpability', 'ascertain accountability', or 'assign fault'. Each of these phrases touches upon the same concepts and are often used interchangeably, though they may convey slightly different nuances. It is important to find the right synonyms based on the context, as the language used can have legal implications, and determines who is accountable when something goes wrong.